import { ProviderInfo, ModelData } from "../types/heatmap";

interface AuthorData {
  author: string;
  fullName: string;
  avatarUrl: string | null;
  isVerified: boolean;
  isEnterprise: boolean;
  numModels: number;
  numSpaces: number;
  numDatasets: number;
  numFollowers: number;
  numUsers: number;
}

const createDefaultAuthorData = (author: string): AuthorData => ({
  author,
  fullName: author,
  avatarUrl: null,
  isVerified: false,
  isEnterprise: false,
  numModels: 0,
  numSpaces: 0,
  numDatasets: 0,
  numFollowers: 0,
  numUsers: 0,
});

const transformApiData = (author: string, data: any, isOrganization: boolean): AuthorData => ({
  author,
  fullName: data.fullname || author,
  avatarUrl: data.avatarUrl || null,
  isVerified: data.isVerified || false,
  isEnterprise: isOrganization ? (data.isEnterprise || false) : false,
  numModels: data.numModels || 0,
  numSpaces: data.numSpaces || 0,
  numDatasets: data.numDatasets || 0,
  numFollowers: data.numFollowers || 0,
  numUsers: isOrganization ? (data.numUsers || 0) : 0,
});

async function fetchSingleAuthorData(author: string): Promise<AuthorData> {
  try {
    // Try organizations API first
    const orgResponse = await fetch(`https://huggingface.co/api/organizations/${author}/overview`);
    if (orgResponse.ok) {
      const data = await orgResponse.json();
      return transformApiData(author, data, true);
    }
    
    // Fallback to users API
    const userResponse = await fetch(`https://huggingface.co/api/users/${author}/overview`);
    if (userResponse.ok) {
      const data = await userResponse.json();
      return transformApiData(author, data, false);
    }
    
    throw new Error('Neither organization nor user API returned valid data');
  } catch (error) {
    console.error(`Error fetching data for ${author}:`, error);
    return createDefaultAuthorData(author);
  }
}

export async function fetchOrganizationData(authors: string[]) {
  try {
    const authorsData = await Promise.all(
      authors.map(author => fetchSingleAuthorData(author))
    );

    const primaryAuthor = authorsData[0];
    
    const aggregatedStats = authorsData.reduce(
      (acc, authorData) => ({
        numModels: acc.numModels + authorData.numModels,
        numSpaces: acc.numSpaces + authorData.numSpaces,
        numDatasets: acc.numDatasets + authorData.numDatasets,
        numFollowers: acc.numFollowers + authorData.numFollowers,
        numUsers: acc.numUsers + authorData.numUsers,
      }),
      { numModels: 0, numSpaces: 0, numDatasets: 0, numFollowers: 0, numUsers: 0 }
    );

    return {
      fullName: primaryAuthor.fullName,
      avatarUrl: primaryAuthor.avatarUrl,
      isVerified: primaryAuthor.isVerified,
      isEnterprise: primaryAuthor.isEnterprise,
      authorsData, // Include all authors data for multi-logo display
      ...aggregatedStats,
    };
  } catch (error) {
    console.error(`Error fetching organization data for authors:`, error);
    const primaryAuthor = authors[0];
    const defaultAuthorData = createDefaultAuthorData(primaryAuthor);
    
    return {
      fullName: primaryAuthor,
      avatarUrl: null,
      isVerified: false,
      isEnterprise: false,
      authorsData: [defaultAuthorData],
      numModels: 0,
      numSpaces: 0,
      numDatasets: 0,
      numFollowers: 0,
      numUsers: 0,
    };
  }
}

export async function fetchAllProvidersData(providers: ProviderInfo[]): Promise<ProviderInfo[]> {
  return Promise.all(
    providers.map(async (providerInfo) => {
      const orgData = await fetchOrganizationData(providerInfo.authors);
      return { 
        ...providerInfo, 
        ...orgData
      };
    })
  );
}

async function fetchAuthorEntityData(author: string, entityType: string): Promise<ModelData[]> {
  const response = await fetch(
    `https://huggingface.co/api/${entityType}?author=${author}&sort=createdAt&direction=-1`
  );
  
  if (!response.ok) {
    throw new Error(`HTTP error! status: ${response.status}`);
  }
  
  const data = await response.json();
  return data.map((item: any): ModelData => ({
    createdAt: item.createdAt,
    id: item.id,
  }));
}

export async function fetchAuthorData(author: string): Promise<ModelData[]> {
  const entityTypes = ["models", "datasets", "spaces"] as const;
  
  try {
    const allData = await Promise.all(
      entityTypes.map(type => fetchAuthorEntityData(author, type))
    );
    return allData.flat();
  } catch (error) {
    console.error(`Error fetching data for author ${author}:`, error);
    return [];
  }
}

export async function fetchAllAuthorsData(authors: string[]): Promise<ModelData[]> {
  try {
    const allData = await Promise.all(
      authors.map(author => fetchAuthorData(author))
    );
    return allData.flat();
  } catch (error) {
    console.error("Error fetching data for all authors:", error);
    return [];
  }
}